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Wear properties of ECAP-processed ultrafine grained Al-Cu alloys
Abd El Aal, M.I.,El Mahallawy, N.,Shehata, F.A.,Abd El Hameed, M.,Yoon, E.Y.,Kim, H.S. Elsevier Sequoia 2010 Materials science & engineering. properties, micro Vol.527 No.16
The wear properties of equal channel angular pressing (ECAP) Al-2, 3 and 5%Cu alloys under dry sliding conditions using different sliding distances and loads were investigated by pin-on-disc dry sliding wear tests. The wear mass loss decreased remarkably as the number of ECAP passes and Cu content increased, being affected more by the sliding distance than by the applied load under the experimental conditions. The wear mechanism was observed to be adhesive and delamination initially, and an abrasive mechanism also appeared as the sliding distance increased. The analysis of the wear surface indicates a transfer of Fe from the rotating disc to the Al-Cu alloy pin with increases in the sliding distance, the applied load, the number of passes and the copper content.
Recessive Trait Crossover Genetic Algorithm Flight Control System Design
A. A. El-Mahallawy,A. A. Madkour,A. M. Yousef,H. A. Yousef,M. I. El-Singaby 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
The requirements, design and simulation of a flight control system for precision tracking task, called pitchrate control augmentation system, is considered. This control system is designed for the F-16 fighter aircraft model using the recessive trait crossover genetic algorithm. The behavior of this controller is compared with that of H¥- mixed sensitivity approach. The flight simulations reveal that the desired performance objectives are achieved and that the controller provides acceptable performance in spite of modeling errors and plant parameter variations.
Hossam M. Yehia,Nasreen Abdelalim,I. El-Mahallawi,Tamer Abd-elmotaleb,W. Hoziefa 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
In this study, alumina and graphite in a 98 % to 2 % ratio were prepared by mechanical milling for 80 hrs, then surface coated with 2 %Ag. The motorcycle wheel aluminum swarf was melted at 800 °C then the new hybrid (Al 2 O 3 -GNs)Ag in proportions of 1, 2, and 3 wt% was added at 600 rpm for 10 min. The microstructure of the rolled samples showed a good distribution of the hybrid (Al 2 O 3 -GNs)Ag and good adhesion with the aluminum matrix. The hardness increased by adding alumina and the hybrid up to 3 %. The as-rolled 3 %(Al 2 O 3 -GNs)Ag samples gave the best mechanical properties (yield strength, tensile strength, and elongation) compared to the as-cast aluminum reinforced with alumina and hybrid. The corrosion rate was improved by reinforcing the aluminum with the hybrid (Al 2 O 3 -GNs)Ag. Due to reducing the particles size and increasing the surface area after the rolling process, a deterioration in the corrosion resistance was observed.